Photographic-printing apparatus



Mar) 3, 1925.

1,528,307 K. SCHMIDT PHO'I'OGRAPIIICA PRINTING APPARATUS Filed April 18, 1921 "wwf-Tm 6 Sheets-Sheet l ffamey `-Mm. 3,; v1925.` 1,528,307

K. SCHMIDT PHOTOGRAPHIC PRINTING APPARATUS Filed April 18, 1921 6 Sheets-Sheef 2 z'y .f6

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by v BEQQNWDMW Mar. 3, 1925.

K. SCHMIDT PHOTOGRAPHC PRINTING APPARATUS Filed April 18, 1921 6 Sheets-Sheet 3 @may K. SCHMIDT PHOTOGRAPHIC PRINTING APPARATUS 6 Sheets-Sheet 4 I j/amey Mar. 3, 1925.

1,528,307 K. SCHMIDT PHoToGRAPHIc PRINTING APPARATUS Filed April 18, 1921 s sheets-sheet s l l# B L l! M MLB AWM/Vey Mar. 3, 1925.

1,528,307 i K. SCHMIDT PHOTOGRAPHIC PRINTING APPARATUS Filed April 18, 19:21l e sheetssheet 'e by@ 'Ee 'nl f/farney Patented Mar. 3, 1925.

UNITED STATES KARL SCHMIDT, OF BERLIN, GERMANY,

PHOTOGRAPHIC-PRINTING APPARATUS.

Application filed April 18, 1921.

enable others skilled in the art to which it appertains to make and use the same.

The presentinvention relates to improvements in photographic apparatus and more particularly in printing apparatus.

It is the general object ot the invention to provide a printing apparatus in which the various mechanisms are correlated in a simple manner and afford reliable operation.

For the purpose of explaining the invention an example embodying the same has been shown in the accompanying drawings, in which the same reterence characters have been used in all the views to indicate corresponding parts. In said drawings,

Fig. 1, is a t'ront view of the apparatus,

Fig. 2, is a rearv View thereof,

Fig. 3, is a vertical section ot the upper part of the apparatus,

Fig. 4, is a side view seen from the lett in Fig. 1,

Fig. 5, is an enlarged detail view seen from the front side of the apparatus and showing the web ieed rollers and the cams and slide bars tor operating the mechanism for lifting the web of paper into contact with the negative and for removing the shutters covering the negative and exposing the same to the light,

Fig. 6, is a horizontal section of Fig. 5,

Fig. 7, is aview of the parts shown in Fig. 5, seen from the rear of the apparatus,

Fig. 8, is a front view of the box supporting the negative holder and showing a part ot' the mechanism for operating the shutters covering the negatiif'e,

Fig. 9, is a cross-section taken on the line A-A of Fig. 3,

Fig. 10, is a horizontal section taken on the line B-B of Fig. 9,

Fig. 11, is a section taken on the line C-G of Fig. 10,

Fig. 12, is a detail sectional view taken on the line D-D of Fig. 10 and showing one ot the cam plates for operating the table for lifting the web of sensitized paper into Contact with the negative,

Serial' No. 462,275.

Fig. 13, is a detail View showing the slide supporting the web roll,

Fig. 14, is a plan view of Fig. 13,

Fig. 15, is a detail view showing one of the bars carrying the web roll,

Fig. 16, is a vertical cross-section showing the negative holder and the box supporting the salne, and

Fig. 17, is a plan view of the negative holder.

In the example shown in the ligures the improved printing' and developing apparatus comprises a casing l having legs 2 and supported on a frame 3. On the said frame a motor 4 and a belt gearing 5 are mounted, which are in driving connection with the operative parts of the machine.

The casing 1 is closed all around so as to exclude the light and within the same there are the various devices such as a roll from which the web of sensitized paper is taken, mechanism tor lifting a part of the web into contact with the negative for printing, the guides for the web, and the means for developing, ixing and washing the sensi` tized web. On the top wall of the casing there is a box 6 which is open at its top and bottom, and which is adapted to expose the negative and the portion of the web in contact therewith. As shown the said box is equipped at its lower part with a pair of hinged shutters or blinds 7, 8 adapted to be rocked upwards and into exposing position, as is best shown in Figs. 3 and 8. The box is mounted on a frame 9 which is mounted on an axis 10 for being rocked 'upwards and into the position shown in Fig. 1 in dotted lines'. The frame 9 is formed with lateral guide ways 91 for a negative holder 11. As appears more particularly from Figs. 16 and 17 the said holder consists of a trame having two windows 12 and 13 and adapted to receive two negatives at a time, and it is slidable in suitable guide ways so that either one of the negatives can be set in printing position. The negatives are placed within the frame 11 with the film side directed downwards, so that the sensitized paper can be pressed in direct Contact with the film.

As the light must pass through the whole area of the negative, the negatives bear only with their margins on the frame 11, or they bear with their whole surfaces on glass plates disposed within the trame 11.

Below the box 6 a window is made in the top wall of the casing 1 and below the said window a table ,14 is mounted for reciprocatingin vertical direction, whichtableis covered with a suitable soft material such as felt, rubber, or the like. As show'n' :the table is secured to atransversebuar"ld'the bifurcated ends 17 of which engage vertical guide rails 18 secured to 'opposite'walls' of the casing 1. To the bar 1 6, two bolts 19V are secured which depend downwards therefrom and pass through-holes made in atransvrse bar 20, Vand on the said bolts there are coiled springs 2l which bear with their'lower'ei'fds on thebar 20,.and with their upper ends on the bar 16. The transverse bar 20 is en-v gaged by cam slots 21 made in twokcam disksf22 keyed to va rock shaft 23 mounted in and projecting through the front *and` rear walls of the casing 1. vTo one `ofithezprojecting ends of the shaft V28 an arm `24 is keyed which is adapted to lock the framell in position with one orthe' other of its windows in printing position' and which for Y this purpose engages in one or the other of two slots-111 of the said frame. To the opposite endof the rock shaft agear wheel 25 is keyed by mea'ns of which the shaft and the cani disks 22' 'are rocked to and. fro for Vimparting reciprocating movement to the tables 14, 15.

Below the table `14-,tlie roll 27 is`located from whichfthe webv of vsensitized paper is taken. As s hown the roll yisfmountedont a spindle 28 bearing in slop'ing` notches V29A made-.in two rails 30. The rails' providelateral'. guides for the rolls anfd they are mount,- ed on rods 31 for being adjusted longitudinally of the spindle 28 to accommodate rolls of different lengths. For fixing the` rails in Vset positions suitable means such as .seti

screws 32 are provided. 1 The rods .3.1 `are securedto rails. 33 which are longitudinally transverse rods 39 so as to provide afraiiie which is retracted fromthe casing.'forput-A ting in a new roll `and is pushed into ythe casing with the new roll place-dl'thereon. To arrestthe frame when retractingthe Same from the easing stops 40 and 41 are provided respectively' on the rails 34 and 35. To permitinsertion ('ofa roll the casing 1 is provided witha light-tight door 42,',as is shown in Fig. 3. i i r" -v The web is taken :from the. roll ,by means lof a pair of feed rollers 62 and 631 and it' is fr trained on guide rods43, 44 `and 45which are` providedv adjustable members 46 forlaterally guiding they web, as isshown in Figs. 10 and 1l. On the shaft 23 a frame position the roller48 is heldin braking 'engageinent with the roll.

Theipart of the :casi-ng 1 which Vencloses the roll 27 vis. separated from the'part 1 by; a partition 110 and within'the "chamber 11= thus provided lthe developing. fiXin'gaiid: washing apparatus are confined.` As shown in Fig. l3, these apparat-us coinprise'six'upright dishes 51,52, 58, through. which the web of` sensitized paper afterY exposure is passed upwards and downwards, asis known in t-he'zart". Y f

The dishes y51* contain the' developingA bath, the ,ldish'es 52 the fixing'bath,` and. through theydishes' 53 water is circulated. lYithin the dishes there are removable frames. 103 provided with upper and-lower guide rollers 54 for successively passing'theweb of; paper through the` dishes. In'. the preferred construction shown in Fig. 3 the frames 103V are suspended wi-th 1 their 1 upper` ends from vsuitable supportingV members "providedet thel front` and rear walls of the casing 1, and they do not bear on' the bottoms. of* the dishes. Therebyf the proper.l positions ofthe frames 103 with all the rollers 54. parallel to eac-h other is insured, 4so* as jto,provide uniform guides for the web. f Below? the lower guide rollers 54 the dishes areformed `with extensions for the irecepl. tion of deposits from the baths. vThe dishes 5l and 52' are formed at their bottoni parts with tubular portions for connecting fleXil bletubes 56. thereto which are norma-lll;v fixed by means of clamping 'members to the out'- side of the casing, and which carryyfunnels 5 8 at'their Vupper ends. Through thesaid funnels 4the liquids are supplied to the dishes and the level `of the liquid within. the` dishes is determinedby the position of the funnels. By lowering the tubes 56. thefliquid is withdrawnfrom the dishes. The dishes 53 are connected kwith each other by ka tubular portion 59 and they are connected with a flexible inlettube 60 adapted tobe con-Y nected to a water supply and with a Vcommon discharge 61. Y i Y v vThe `feed roll-ers 62, 08: are providedflaterally of the last one of the dishes. WhenA printing thev webf of pape-r must .temporarily be arrested below the negative. 'Therefore the'feedroll-ers 6,2, 63are. intermittently op-.` erated which is donefin lmy improved. ap-z paratus by the following. mechanism.kv TheV gearing is operatively connected with a pulley 64 keyed to one end of a shaft 65 rotatably mounted atone of the sides of the casing 1. To the opposite end of the shaft a gear wheel 66 is keyed which is in engagement with a gear wheel 67 carrying a crank pin 68 located in position for operating a rocker 7 O mounted on a pivot bolt 69. In front of the rocker a i'ack 71 is mounted which is slidable in vertical direction, and which carries a pin 72 adapted to be engaged by the rocker for lifting the rack. The teeth of the rack are in mesh with the teeth of a pinion 74 which is loosely mounted on the shaft 73 of the lower feed roller 63 and which is secured to a ratchet wheel 112. To the shaft 73 a disk 75 is keyed which carries two pawls 113 engaging in the teeth of the ratchet wheel 112. It will therefore be understood that by rocking movement imparted to the pinion 74 the shaft 73 and the feed roller 63 are operated in one direction only. The rack 71 bears with its lower end on an adjustable stop member such as a screw 77 adapted to be secured in position by a nut 76. By setting the screw 77 the stroke of the rack and thereby the length of the feed of the feed rollers can be adjusted.

The gear wheel 67 is uniformly rota-ted from the motor 4 and through the intermediary of the gearing 5. Thereby the crank pin 68 rocks the rocker 70 upwards, and when moving upwards the rocker carries along the rack 71 and the gear wheel 74. During theI upward movement of the rack the feed roller 63 is advanced a distance corresponding to the stroke of the rack. After the crank pin 68 has passed its uppermost position the rocker 7 O and the rack carried thereby drop downwards, and finally the rack is arrested by the stop screw 77, while the rocker 70 continues its downward stroke. The downward nio-vement of the rack is assisted by a spring 78. The downward movement is ineffective as to the roller 63, because the pawl and ratchet mechanism 112, 113 is operative only during the upward stroke of the rack. The length of the feed of the web is varied by adjusting the screw 77. By screwing the said screw downwards the stroke of the rack and therefore the length of the feed of the web are increased, and vice versa. It will therefore be understood that the length of the feed can be a-djusted without making any change in the gearing and while the apparatus is in operation.

Preferably the feed rollers 62 and 63, or at least theI upper one of them which is in contact with the hlm side of the web, have a coating of rubber, and in order to prevent any slip of the web passing through the rollers the rollers are positively connected with each other by gear wheels 79 and 86.

The rollers are held in elastic engagement with each other by a spring 81 the tension of which can be regulated by a screw 82. In order that the web can not get between the gear wheels 79 and 86 the lower roller is formed at its endswith flanges 83 engaging in annular grooves 84 made in the upper roller. In addition the flanges prevent relative displacement of the rollers longitudi nally of the axes thereof and rubbing of the. rollers on the web which might be caused by such displacement, and finally they prevent access of the water pressed from the web to the gear wheels and the bearings of the lower roller, which water flows downwards along the flanges and into a gutter 85.

While the feed rollers 62, 63 are at rest printing takes place, while the web is held by the table 14, in contact with the negative, and the shutters 7, 8 are rocked upwards and into exposing position. The operation of the shutters and the table is effected from a shaft 86 which carries the gear wheel 67 above referred to. At its opposite end the said shaft carries two cams 87 and 88, and the cam 87 cooperates with a roller 92 provided on a rail or slide 89. A rack 91 carried by said slide engages in the pinion keyed to one of the ends of the shaft 23. As shown the rack is adjustable longitudinally of the slide 89 by means of a screw 90. The cam 87 is adapted to impart rotary rocking movement to the shaft 23 and the cam disks 22 keyed thereto so as to lift the table 14, 15 towards the negative. After the cam has passed the roller 92 the shaft 23 and the rail 89 are returned into initial position by gravity and by the springs 21. The cam 88 cooperates with a roller 93 provided on a rail or slide 94, which slide is jointed to a rocking lever 95. The upper end of the lever is in loose engagement with a rack 96 slidably mounted on the front wall of the box 6. As appears more particularly from Fig. 1, the said rack is formed at its ends respectively at its upper and lower sides with rack teeth 97 and 99 engaging with pinions 98 and 100 secured to the axis of the shutters 7 and 8 disposed within the box 6. lVhen the slide 94 is shifted by the cam 88 the rack 96 is shifted accordingly, and as the teeth 97 and 99 are disposed on opposite sides of the pinions 98 and 100, the said pinions and the shutters connected therewith are rocked in opposite directions. For returningthe mechanism into initial position a spring 101 is attached to the rack 96.

The box 6 and the negative holder mounted thereon can be rocked about the axis 10 and away from the web as is shown in Fig. 1 in broken lilies. Thereby the operation of the apparatus is facilitated. By reason of the loose engagement between the lever 95 and the rack 96 such rocking movethef intermediary' of theslide 94, 'the'rock iiig lever 95, the rali" 96, and thepiiioiis'QS has passedy the slide=`-94, the shutters 7, Sfere retu'riiedinto "el'o 'si1i,gV` position, While the Chih 87 holds the? tble'lll, A1 5 'in 4releifat'l` p05 sitionr until the shutters are coiiipletely closeclY l/Vheii vthe slide 89"is" released 'froii the'oam 87 the table`-l4 15i'oves cl'owiiirds so's to releas'ethe Web. Nftheorahk pir G8 becomes operative, ailditlitsfthe repli 7lby means of tli'eiioeler TQ'Iicl the 7 2.5 Thereby the eecl 'roll'eis 62E and 63 "sidra-libe the web of paper adistiibefcb'espohtling to the stroke of the lreale-7l. lVhii the cank'pin 68 vis infits iipp'ei'ririostpo'sitiii the feecliiig movement is inter'riiptcl'aiid the-rocker 7O`l ancltlieirel; 1 returniiito initil -pfo'sitioirv In the iieaiitiiiethe lciifis" 87 and 88 have lbeen' broghtit'o' positioir for operating the' slides 89 dhd/9.4. lShould it be foiiiid that Ethel: pzfp'er ecl does Y not' Correspond' to 'the length of ltheV` negative,"'it is Tregiiletecl Iby" atljiistigi'lthe screws 77, which lozin'be doiie witliot-. firresting the' apparatus.' Thetihie'oifftlie' GEX- i posure "is 'Varied by re'giilatiiigfthe specl of the motor 4.- `For Very slowbpeitibiioff the apparatus a hand op'erteclbrril v1 02 is: providedwliich is keyed to the; shft 65.

While in ldeseribii'g yfthe 'intention "referenee'fh'as-fbe'e'n made :to 'e "partioulr' example embodyiiig'the' Same, I Wish it tobe iiiilerstood thatl hay 'invention is: not limited to the Costiiition yshown Vin the "flri'v'ings, 'zuid thatI various Chages may Vbemde Vin the pair of i:rollers :for

Vanisni, including )weer fr sensiifz'eifebr@ @die lever.`

Iieg'atiiie, gt tble' 'beloiy the gsiippoit-,f iiiiiiitfI ed for reoipro'zitiiig' moy erneut toivijcl d awy vfrom 'the support', sliiitter iiiech' n 'above ,the Supporti to" over iidelpse "a negative, a, roll' for holding'tlieffseiisitied fabric, l'nielfns yfor giiiding the seiisiti'ze'd fabric between the teble-enlfthesiip rt, 'a

ebrio, iiiezi1is' for op atuigfthe shi tte mechailisimfhieeiis for moiihgwthef teplelaiic'l n ieliguiisiii driving the rollers in one cirectlon buti'ree to turn in opposite direction independently of the rollers,A a rack mounted for reciprocating movement in engagement With said gear mechanism, means for moving the rack in gear-driving direction, independent means for returning the rack and means for adjustably limiting the return movement.

5. In a photographic print-ing apparatus, the combination With a pair or' rollers for intermittently moving a strip of fabric, of gear mechanism connected with the rollers to drive the same in one direction and independent o the movement thereof in opposite direction, a rack mounted for reciprocating movement in engagement with the gear mechanism, cam mechanism for moving the rack in gear-driving direction, independent means for returning the rack and means for adjustably limiting the return movement of the rack,

6. In a photographic printing apparatus, the combination With a support for the negative, of a table mounted for movement toward and away from the support, a roll of sensitized fabric, and means for intermittently moving the sensitized fabric and the table in cyclic order, comprising cam mechanism operative to move the table, brake mechanism adapted to act upon the roll and means whereby movement of the table toward the support for the negative is translated to actuate the brake mechanism to arrest movement of the roll.

In testimony whereof I hereunto set my hand in the presence of tivo Witnesses.

KARL SCHMIDTq Witnesses:

FRANK REINHARD, GERTRUD SGHWERZ, 

